One, because of the sound proofing.

Two, because of the experience of the engineer who can set up the right mike at the right distance etc etc

Three, because the learning curve on decent software is hellish steep and how mant hours are you going to spend learning to do what a pro can do in minutes?

"remember, you can't polish a turd!!!"

But you can roll it in glitter if you have enough time to spend!

Steve